With all the basics cleared out, let’s get right into it. As we are using an ESP32 to build this project, we can easily make this meter IoT enabled and log data over the web, which is the topic for the future project. Building your digital meter not only reduces cost but also gives you a wiggle room for upgrades and improvements. Rather than purchasing four meters for the job, we will be able to solve this problem by incorporating the capabilities of all four meters into one. Previously, we have also done something very similar in our Arduino Based Wattmeter project, but here we will measure both input power and output power to calculate power efficiency. So, today we will solve that problem by building an Arduino and ESP32 based efficiency meter that can measure input voltage, input current, output voltage, and output current. Hence, it can measure input power and output power at the same time, and with these values, we can measure efficiency easily. Measuring voltage and current with the help of a multimeter can be a good way to start, but one of the biggest problems I face while testing a circuit is, measuring power efficiency. We are all aware of a basic voltmeter, ammeter, and wattmeters, the three basic things you need to measure values on any electronic projects or circuits.
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